Help with Luba's 3D quest ?

Hello everyone !

I just started Luba's 3D quest and I'm stuck x.x I entered the Giants Fortress, I'm pretty sure I activated all levers but then I saw an NPC who said that I must leave one of them deactivated. Is this true ? And if so, does anybody know which lever that is ? I'd be very very greatful if somebody could help Q.Q ♥

Ah, yes, that is the switch that actually seals off a pathway somewhere else if you activate it. It is in the same area with that woman who told you about it. It's the one in the second room from the right on the top row, so if you activated it, simply go back and deactivate it, and all should be well.

OMG thank you so much ♥♥♥ ! You saved me a lot of trouble, thank you *.* !

No problem, glad to be of help! If you need to know anything else, just ask away!

Well I actually do x.x Sooo... I completed the part with the pit and got back to the fortress, I went to the same place I killed that guy, (I think his name was Garsp or something) and got to this place https://i.imgur.com/Y2Lpkf5.png but there seems to be a gate and it's closed x.x
Is there some way I can open it ? I assume it has to be some lever ? I looked all over the place and could not find a lever though, I'm scared that I probably missed one in the pit or something D:

No worries, no switches this time! If that's the gate right past where you defeated Garsp, then it is unlocked with the Bagdaborom Key, found hidden in that drawer in the room to the south.

Wahh thank you again ♥ ! I just found the key, thank youu !